What is stomach flu (viral gastroenteritis)?
Stomach flu is a viral infection that affects the stomach and small intestine. The illness is usually brief, lasting 1 to 3 days. Stomach flu is caused by a different virus than the Influenza viruses which affect the respiratory tract (nose, throat, and lungs). Learn about respiratory tract flu here. How is it transmitted? Stomach flu is caused by swallowing certain viruses. Infected people can spread the virus through their secretions, sometimes even before their symptoms begin. The virus can be spread by direct contact with an infected person (for example, kissing or shaking hands) or by sharing food, drink, or eating utensils. The virus enters the stomach and intestine and inflames the lining of these organs. As a result, the stomach and intestine are temporarily unable to perform their usual functions. The virus can also cause food to move more rapidly through your gastrointestinal (GI) tract. Some bacteria and other tiny organisms called protozoa can cause infections that have sym
